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Co-electrodeposition and properties evaluation of functionally gradient nickel coated ZrO_2 composite coating

Transactions of Nonferrous Metals Society of China 2018年第1期28卷 66-76页

作者： B.BOSTANI N.PArVINI AHMADI S.YAZDANI r.arghavanian Faculty of Materials Engineering Sahand University of Technology Department of Mechanical Engineering Tabriz Branch Islamic Azad University

For the first time,functionally electroless nickel plated ZrO2(NCZ)graded Ni-NCZ composite coating has been successfully co-electrodeposited from a bath with gradually increasing of stirring *** showed that co-electrodeposition in a bath with stirring rate of250r/min results in the maximum co-electrodeposited particle content and the best particle *** produce NCZ graded Ni-NCZ composite coating,the stirring rate was continuously increased from0to250r/*** electroplated coating had a continuous gradient increasing of co-electrodeposited NCZ content from substrate towards the *** results showed that with increasing the co-electrodeposited NCZ particles content in Ni matrix,microhardness increases from interface towards the surface of the *** crystallite size of Ni matrix and higher co-electrodeposited hard particles content were recognized as the reasons of microhardness *** test revealed that the functionally graded composite coating shows more excellent adhesion to the substrate compared with the ordinary distributed Ni-NCZ on the same *** result is attributed to lower mechanical mismatch between coating and substrate in the functionally graded composite coating with respect to the uniformly distributed *** results of wear resistance measurements reveal that wear resistance of functionally graded Ni-NCZ is higher than that of ordinary distributed composite coating.

关键词： co-electrodeposition functionally graded composite coating microhardness wear resistance adhesion

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